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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f1d0dff3c4d88bbe1815db3c3dfe818755d8a165d7b2437178228b01dcbdb5c' 
  AND token = 'rqsruuPQCN6g/HeUTFp9bbm9EQs+IQ3rUVoqyvqqIls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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