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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c695883ca71e8be97cc77a782584dea2fa9d50e55fee6f132e38e732125a9be6' 
  AND token = 'lR95x5cnrA9Ua2fhY/yL/NNHv0UbC+CEblEbt6sDl08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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