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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '902fde5bb56eadbddb4929e398ce52791567e0bbae039918f219538e6da5e29b' 
  AND token = 'xW7s10fqM/iaa4639u+oxADHpzp1ugSz+hhPpC4yR34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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