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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c52d4a9c9e9c9c7e324b51887885e8831d6c9a2cd704018495acc0f9d7e69fbb' 
  AND token = '+7gpo0dz82KyCcFM1vZok1bL/s8uToIwYwgNYFXJabA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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