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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f17e72a9b875f0184f7826d3cb16e8e5f7f714ef9401fa3e91146d0171e86a3c' 
  AND token = 'BVGFcI/0XINqMCmO6wAkp4EthX421NBwK0qIggR3d1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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