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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a8d059352e44b1f28e8fa52938ab4a0bdbe0d83ea22b6e8bdc9c0c93ead7311' 
  AND token = 'qZvXYDCNLLpa+m1fCnnWFgB4c52nll9KSemQM/XRTZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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