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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6175a37b5d98560d73eb0f79dfdc37fed39f6e67cb64b3d816e9d24fb6596d13' 
  AND token = 'djRhOPQMsDqePjM3ARHX83ckn7aMtmhm4X3BvqY4KSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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