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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d954f3394d04c7233a64fd3b32d7acdee19554427aab07c214d0f525f89062a' 
  AND token = 'ZtZ5lzSGAs5j6P70C+oprbDaTtBOcyL8gYkQ3GKnWq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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