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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2936b56531654ec3bfb7ffc8b1e5f208f419856c04f0bc16782aecb0992977bc' 
  AND token = 'wlX5sOT7CsxHSUxbQ7Ik9YGINXq3mfrtYCGL5i88Grw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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