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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f58c75c6a2fc60e723cafb6fb18f32570b85c443628948a1e69fdd8833fc492' 
  AND token = '/BN2Hlc/7vkYzuJjL3ONCIln5y1s+XHR3i3MSXYcLOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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