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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '893d4891c9033aee05ecb684edf9b4594ae9ed5b3d6b00b266c97b077a82f1f3' 
  AND token = 'Q46MdIbgqwnJztONfwEmlCQELu+82gC60+Yg8VUWTzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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