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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04cd3ad0c27b63e7719b77a33a72843c82f2114bcd20db041408fd0e5e7e2e5a' 
  AND token = 'FRmHpX997htCwhqIlrNT2Q3E6hQ3NK0Csi8h+o//Cog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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