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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff84dd998d47aa3a39a8d9047c76b857f31457714ee568f47db0c425e5bf5006' 
  AND token = 'LgJMiv9bUE6ng7e7W59aDzcOpOWhbN4n1SbFKQF7+2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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