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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '497812700d7f760d3f06b85366d5d65a70385326d24a67aa498327408463d08f' 
  AND token = 'v0WnCj3OQV1H0TidzGyqQRyMcAghMOgD6rwZ2y2Vj6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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