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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7881b2676f454e8e9cc36214c1e317f59011c56c59a498b7ecf387a3fe10a406' 
  AND token = '5Q8rPWMx9WROUkJbLNX1OK8YqFBcW7QH31HJIkGGQas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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