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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81ad32c1fc13a0ffa188dca29fa693c72ecc7e1062b961843218dd1740b14661' 
  AND token = 'hNywPn6QovMIREcqSKEXnEiQYdMVw1zhO93fz9wjHws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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