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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6289c46e7835e6c430d4a36438d3a943cc07a67af5ef757b1a0321d3f3d3f562' 
  AND token = 'Q0WK1ykr22AK1661dtHvjEKV7cpUhaWHtUkHq84Kp6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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