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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b00027e0c5e4fa39152b705fb87629fc75434da7bb7c0307fc8d3da5407ac53b' 
  AND token = 'YiW3d9iJtNGAEsbiAnMtxVgRx8QQ4q4em+yZc+rG9SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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