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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f74088175b80cf5b4303ca307cf417f276284f73887a0311c2a5e469c6083bf6' 
  AND token = '3oibkvR9BYgE9UNnbRN0tZiBDBish1b6Uhu1bWGB4JU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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