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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f311103b36e59c7183b5598082174a9140e7114cfc9c2b3a3728a3d23d5c284f' 
  AND token = 'WHWNcZjN+YiDwTEb23BU/SBQ996gQHRznj0DdLYAOto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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