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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '078f46c3edb33f5dd6bb3dbe68e4b9a9d61db37e7ba95a2a0444b5cc6428cc14' 
  AND token = 'Xn0mj2XAz7VJSeoECaudJbKMJZgR31w0s2bm2WehOgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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