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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9fa4efbef4d8ef23f0de02c7e9f0264ffefabfb24a642361f87c9915ad9d37e' 
  AND token = 'wmCwtzQxt62ubCr0+/f0NF0kdiI9hq68stXzKxFniBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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