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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01091b7db02d76112da777dd8e094a282ed8cb2fce02c897864d527fd63d05c8' 
  AND token = 'WLv2EQc6ke82ksQJzpZKwjpfadu3QCoUroQ1C56Uihw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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