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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2fbc9ed44da464f67ba447416e80962537b97aea6041a762f7f651918215f1f' 
  AND token = 'kzy/htBfBfwC/5LPot0Xe9DQwmsiHAEQ3ugeChXHamE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00091

JSON explain

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