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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06ad8103e611a98e2bbed16b349a68292e42832742c8ab0b9b1ee6a1037e7240' 
  AND token = 'A8DIbUrkX0XqmfivhsUeYVkAHX/NqYIrP26yP7b/CvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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