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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a0a9bf817d64e5985d1950009d0c8e903ea63ecaa5e59b25df57b3c8da46c84' 
  AND token = 'n03E4kuoLLQeCl2MYNm+woUcL43XpPl8wE66H6sOgOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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