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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffe0ffecff53ba416d5130fd608bee910e577d842f6aafa9ccb5caaba108f7be' 
  AND token = '5Iea/a8C+YD6O0nm3TkklEjjZWavRBl5dlqDEsxvUfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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