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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32b7d23d2e9cfc4df7c741b5d553d72fc2b8663f9d14d531481571480b4ed1d1' 
  AND token = 'SoZiiM9dU/YJrhrNWXPU/ytjx+8pyRjoMtqI1EhZNa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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