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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd87201fbc621e0d40496c1e6a7a55204e1dbd504ffebf52aa202007930b01d03' 
  AND token = 'kuPyiggC2EVl7wR5K5+PGjB3UDgGgtjJRdo/P78DQrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}