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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0306e995923d7af5174438cae2f40550dbe063ade40eea8b3c36f0febbb3c7bd' 
  AND token = 'BfwXNBW9sa68OHj/Wo51NJwqLxPNqB82ert5CLEmsD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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