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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e6c1b2cf98e7808675eb7fa1a6b47284bed8154ee15c325a96a1d99a964b335' 
  AND token = 'pPHcMM+69+BL1VKUVbKox5z1CKI2MH8umfHGm6XyxSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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