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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '476ac056e26a2a1a2d653a53f2e82265c586c34af8b870709642d64ec94d70fd' 
  AND token = 'Kbadma0WZjnmV7rUUVVTHIqC8pB7vdCMkzN6PeKRDPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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