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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '164d2fe5f4a1cd359ebe00b1b703551f6aa2e02b473123adedbb759ed930127e' 
  AND token = 'XWGIq/s3fSN38hFc0DEaT94+a8JmpfxjXTJH3LhsDZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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