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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ece4b1902c40827ee50aa06e3620735649b328f8f60353ed4ef26d95150ef035' 
  AND token = 'enS35pfXcb733oeBktXLgAiZVe+Bto0f3Ps8eF/NV6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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