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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eb3cf5316ddc3e473d9ca0651da3d041f3f1a53fef5abf70db8cf7ec89c0c5d' 
  AND token = '7k8C192WuXu6doCPClIikG34Kpn9sKQwp5h2XCJTFic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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