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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e0ab915516b36d7022f64f554a917fab93f9284ae4a14e24c20bb32d4e8eec0' 
  AND token = 'mJu4fV28oQNoAviLjwCP9DVcgrPlI0Fy9E2PtF4VwZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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