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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1bc3ef737511602b07e94063616bc0c6a3cc2ccad096fd1a958cad4f0e9417b' 
  AND token = 'JRdGiWgMvnkX35iq5GCQelTZ4bX5KQ5yhMez3T/jVoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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