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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff79001df1623ce47963deb88881ccc528502c92ee03f2f96e10b13bded12d55' 
  AND token = 'RYL4G+uSI+vPddxDhxWh6pzVf7Z6LOIMqs16kJKkpRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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