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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c7cc734e864bd534f2f32717c95ea12bb6018af17f1039664e5ca59b24bb4fb' 
  AND token = 'Sb30ZKbtjjjhvCo2eo12wx5bm990bONs0NCRaG3plhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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