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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aacc8c70a60422a0bd28fcf97556471ee38b932a9d9765993b1ffbf9ddbc8d1' 
  AND token = 's4LoZmSmTdHmTIefd1c7sJt4gSSShkUL1QiZ59yH/YY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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