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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8c66e681556b2d4d353bf19bb441f6c5cc805e9440d6c8b14aef6e33ef86a9d' 
  AND token = '62W1U9gHg8DUntz9Hb3hH/BpIpuqM7d9mtnRL+NPk/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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