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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '824124ea7b955d36e28a16cf1b1bd33b0dfbf0167d1083ac45cfbc23dd8562fd' 
  AND token = 'BXCwVNq1jVq6haV3dPHCwlHzxR7nxVfgU3bHQ4dINhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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