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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9a7852e0ad029393fce27db614a1c1823fab3b1a62eb928f062ea51b53104ce' 
  AND token = 'g1Ii6br/ZtFCDOSsym5lOagNwUO/aPnzNsxmSGhIB9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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