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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15014ca1867db8479c2f0f39a00d6dcd5e2702b68b35215dddebcea0b4c27c32' 
  AND token = 'Rl7OQYk4Z6fTnf5fQT644FULXFSzb/p5coogjs+b2P4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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