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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1a782522eb4e551706c8d0c0417aaca15987e2580cfe3cf12417492d5744ac9' 
  AND token = 'OgCNIcdPODpi4H6jDK1qdr8IUb5W6ZKIydYPKxO/3J4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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