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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82feeaff45dfe5165bcd878002ebd890cf10578cf23dd9387f3b3975149e9012' 
  AND token = 'Xw0gT3Ne83SxFWWd0WaXseUSZot+FzacFSAdI6U+TmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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