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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cedfb4a4615292db8bd739914de6bf8a8b8214cae59d2c6e59debf442e3d12e' 
  AND token = 'Ikmwieim/M3gWiFokwLw96AQGV9WqXwX85suYpD+S6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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