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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea0c8c4755cc43c6665da0534181c0c23a1022707a50c91524a24c81c46353c5' 
  AND token = 'QqRlszbV0J0DLs7SvgOqN2TGtiUl0XabhOYS8btaugg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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