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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1c64d3bbdcc937a2bfbffb522ba0a1740669b4cf673aacbfe273f7d77451468' 
  AND token = '8AG5L4z7UrP5OYGGwae5MTdw74WXe//FGSGttRarpec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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