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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90c59d3a083f10517b0db32fde6ed8793a983a4ab9e7e0abaea7a1420f41ed8a' 
  AND token = 'UMK6EM316g7WMRQYDG1POBMw+ZbaDnro+fmUJ/6csmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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