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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e399bb7b0ee7d019bef7928574f9cefbfa3efac079738f035b5433422d0d632' 
  AND token = 'mm14f8VS7muNw7dtjDnKSKs03Gmn8QgDHxZhraX8ttE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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