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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bb329c64b4bb0daf06c4839af6f1deda2b1f94e78fe244ff9e7791851b6ae20' 
  AND token = 'LpA+cC8wh7TDKrEz6/siQ8RBMbtneEBy8nf1ZVXH56w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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