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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84efad59a16a28af0c148d69dc319f44f3a92441e6ef34562951215e276b0b29' 
  AND token = '3p3ti/RBtQyaK2FiiVaLENTVItbB7H16seH2V/D3kKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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