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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9df449f6995a7ab9b3ebfa500b91c2daa0336586eeea0f58ff1cc110d45ea55' 
  AND token = '/HTPpQ3NMQKEP7NJ8kQpkKPfimLw+NHOFSo2rxwC13k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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