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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa719d2bd0ae030c0fda87b57f89e47703a472b0cb4ffd0102c87cecaa17ae40' 
  AND token = '7zb0zP0WJik2m0J11FC8Wx+zSPQ1JrIRZktFJ3ZIgzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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