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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '988cc9d64dbea0edafa887e1d48952b0c3a70257fe283b67be84ab3747bb9937' 
  AND token = 'ACAnw0Jcs4dzcUb9BPvbgGJzfuoNTkyCvtYbYbHlMWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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