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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b5d357fd8ed51dcdfb2e606500b151e1f6ee70661bb891a0019d619f2f8094d' 
  AND token = 'R/vBrbCuZhg4wMVfZ1yd3cxsbsbj/sXK/yTiddab9oI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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