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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e79df6df23cccbadc6723711aeabc1384ab577544dbcaf6f42c49baf904a9fa' 
  AND token = 'L/jcC2RYguEQzHetzOmXNrJf2fnjgHGo5DqpTz0JfWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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