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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45061867a03a7d0ee5fcfea1fbf4f0bb6e329758cb430b95fa949d00b36f576a' 
  AND token = 'k1fHHCM19WU/895BT1yEg6K9VzS/I0954QHyK9g00DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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