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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c9aa3c747dcfa77c72e1513d3fb084b04e9d1dd7db111880b8b2bd1334df315' 
  AND token = '8ZZeJ7yPnTPjP0HVM9Vx6O8XBpB1ZJwfVp4LWjbOSq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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