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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f5503e3abc2fb428290e1b7f223d60d14c1dfe8f5a71c2123438864721c92d4' 
  AND token = '95sjieC5MicERD38+SiWg3quykEVZGgAocbD//mw+fE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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