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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95df875aa0adf6a3dcd333bd40c427f6eff7473ac34e697072010039ba926f39' 
  AND token = 'fHRTzhrF5/7FyyBjhHXr3fgrIoLiUR4Anbif6e3rooA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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