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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d50c36e77949f15687613cf7ee4941398bf93793876c471e168b1d9d7cff743' 
  AND token = 'mZATenDwAu/d0gQxmJxfzhOg0lVboq2Q4dpF35lxcPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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